The goal of marriage really shouldn't be getting a visa... I'm saddened that we have to entertain this solution. It feels almost like exchange my body for some materialistic goal when I think about it (of course I'm not OP).
If so, get married for the visa, it doesn't change anything important anyway.
Incidentally this is what me and my wife did so we wouldn't have to deal with the immigration lottery, it's working for us.